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vivianchao

гæ (СÓÐÃûÆø)

[ÇóÖú] lingoÇó½â×î¶Ì·£¬±à³ÌÓï¾äÇó´ðÒÉ

DijkstraËã·¨¡£¾ßÌå´úÂëÈçÏ£º
model:
sets:
city/1..6/:L;
road(city,city):d;
endsets
data:
d=10000;
enddata
calc:
d(1,2)=50;d(1,4)=40;d(1,5)=25;d(1,6)=10;
d(2,3)=15;d(2,4)=20;d(2,6)=25;
d(3,4)=10;d(3,5)=20;
d(4,5)=10;d(4,6)=25;
d(5,6)=55;
@for(city(j)|j#lt#@size(city):@for(city(i)|i#gt#j:d(i,j)=d(j,i)));
endcalc
L(1)=0;
@for(city(j)|j#gt#1:L(j)=@min(city(i):L(i)+d(i,j)));
end

×îºóÒ»¾ä @for(city(j)|j#gt#1:L(j)=@min(city(i):L(i)+d(i,j))); ²»Ã÷°×¾ßÌåÊÇÔõôÔËËãµÄ¡£±ÈÈçj=2µÄʱºò£¬ÎÒÀí½âµÄÊÇÖ»Äܵõ½L(2)=50.µ«ÊdzÌÐòÈ´¿ÉÒԵõ½LÊý×éΪ0,50,35,30,0,25.
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